Unveiling the Role of CNTs in the Phase Formation of One-Dimensional Ferroelectrics

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• 作者：Amit Mahajan ; Ian M. Reaney ; Pedro M. F. J. Costa ; Angus I. Kingon ; Zolt谩n K贸nya ; 脕kos Kukovecz ; Paula M. Vilarinho
• 刊名：Langmuir
• 出版年：2015
• 出版时间：June 23, 2015
• 年：2015
• 卷：31
• 期：24
• 页码：6713-6720
• 全文大小：521K
• ISSN：1520-5827

文摘

Carbon nanotubes (CNTs) have the potential to act as templates or bottom electrodes for three-dimensional (3D) capacitor arrays, which utilize one-dimensional (1D) ferroelectric nanostructures to increase the memory size and density. However, growing a ferroelectric on the surface of CNTs is nontrivial. Here, we demonstrate that multiwalled (MW) CNTs decrease the time and temperature for the formation of lead zirconium titanate Pb(Zr_1鈥?i>xTi_x)O₃ (PZT) by 鈭?00 掳C commensurate with a decrease in activation energy from 68 卤 15 to 27 卤 2 kJ/mol. As a consequence, monophasic PZT was obtained at 575 掳C for MWCNTs/PZT, but for pure PZT, traces of pyrochlore were still present at 650 掳C, where the PZT phase formed due to homogeneous nucleation. The piezoelectric nature of MWCNTs/PZT synthesized at 500 掳C for 1 h was proven. Although further work is required to prove the concept of 3D capacitor arrays, our result suggests that it is feasible to utilize MWCNTs as templates/electrodes for the formation of 1D PZT nanoferroelectrics.